Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f65eddce107f364…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 16:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38181c94447ce1099514a8d8b5e4e594 SHA-1: fb178cfb2c75d35093aba1791c40b6f8b900ad4c SHA-256: 4f65eddce107f364addacbbd10f4bd33c6e7f1bd8bc6bbe398a3db9c9be9c95d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3492dc2015e859194e58e49c1e24e967/99555033670.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e34080e2d---gadopebezefisamabofudok.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c872110ec729e0871e7fac0ba7c067c1/sisomikoradofunomow.pdf
    • https://llibreriaha.com/img/events/file/14423000162.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fcb05db21fa8fcb627f0de96b0ca2351/ritibux.pdf
    • http://a-swiss.com/upload/userfiles/file/79883421950.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c621d265---54275297758.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4b3d2348---99119316147.pdf
    • https://ebooksweb.net/files/file/70496353080.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074588764a08---wosukenuxopewanusa.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947ba022f3b---93617116927.pdf
    • http://nensi.si/upload/file/simawuropagowokaxuma.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a894c41db---morudolibegenekituruza.pdf
    • http://kaupa.cz/userfiles/file/79811638675.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867d9c2b354---29602560996.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2de9865c284dc1b1b4674b7cfced85b3/10112912448.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/romuguvevevulonufawub.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f11e86252---wuvudasemikasewu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5vik44n263d7dgbv4b5eb8e810/63343951134.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b110da15bb---40836776991.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/bagugazegerofebaf.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160893c0e797bf---zugikozob.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/napijunu.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/jorab.pdf
    • https://langumeistras.lt/i/File/11377863164.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=annabelle+leaving+the+museum
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9b.bin
5ee2b18e1eb928968dbc936534d5b9db28b16a1b50e3a6dd835894068fc8b3ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 10624 bytes
font_01_sfnt_off000104c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 16792 bytes
font_02_sfnt_off00011cd8.bin
f53faa27182f30c3670d8e99fc8f1519505d49a4b31fb7007d78d0b0cf9b1f92
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 17956 bytes